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United States Patent | 6,239,539 |
Mochiduki ,   et al. | May 29, 2001 |
An insulating plug for an electric discharge lamp apparatus, includes: a front portion includes an outer cylindrical portion and an inner cylindrical portion, the inner cylindrical portion having a substantially unique thickness and an opening to receive an arc tube of an electric discharge lamp; a focusing ring extending from the outer cylindrical portion of the front portion; and a rear portion having a rear-end cylindrical portion and a center portion. The front portion, the focusing ring and the rear portion are integrally molded by injecting a synthetic resin into a mold from a gate of the mold, the gate facing the rear-end cylindrical portion of the rear porition of the insulating plug. Furthermore, the electric discharge lamp apparatus in which an arc tube is inserted into the opening of the insulating plug described above.
Inventors: | Mochiduki; Kunimasa (Shizuoka, JP); Harazaki; Masato (Shizuoka, JP); Numajiri; Yasuyoshi (Shizuoka, JP); Fukuyo; Takeshi (Shizuoka, JP); Ohshima; Yoshitaka (Shizuoka, JP); Irisawa; Shinichi (Shizuoka, JP) |
Assignee: | Koito Manufacturing Co., Ltd. (Tokyo, JP) |
Appl. No.: | 201808 |
Filed: | December 1, 1998 |
Dec 11, 1997[JP] | 9-341144 |
Current U.S. Class: | 313/318.01; 313/25; 313/318.02; 313/318.09 |
Intern'l Class: | H01J 005/48; H01J 005/50 |
Field of Search: | 313/318.01,318.02,318.09,25 |
5059855 | Oct., 1991 | Irisawa et al. | 313/318. |
5250872 | Oct., 1993 | Wakimizu et al. | 313/25. |
5463270 | Oct., 1995 | Wakimizu et al. | 313/318. |
5627428 | May., 1997 | Helbig et al. | 313/318. |
5736811 | Apr., 1998 | Westemeyer et al. | 313/318. |
5742114 | Apr., 1998 | Kohl et al. | 313/318. |
5757110 | May., 1998 | Motiduki et al. | 313/25. |
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